Re: Java learning

[Tony Carolla <carolla@xxxxxxxxx>]

Well, initially, I want to use java applets to allow users to select
reports/inquiries, and enter parameters.  Using JDBC, I would
dynamically use their parameters to build an SQL statement, get a
result set, and let the user scroll through a page at a time, modify
their parameters, etc.

Once I have that down, then I would like to get into calling RPG
modules from Java, to improve the reporting capabilities.

You see, right now as far as reporting goes, I am limited (in my
skillset mostly) to providing printed matter, screen displays, or web
pages.  I thought that using java applets would be a good skill to add
to my 'bag of tricks" to deliver reports and interactive inquiry
sessions.

Now that I am seeing the real strengths of Java, I am realizing that
this language can do alot more than act as delivery boy.  It will
really depend on my sales job to upper management ;-)


On Tue, 28 Dec 2004 16:32:58 -0600, Bartell, Aaron L.
<ALBartell@xxxxxxxxxxxxxx> wrote:
> Maybe give some more examples on how you envision using the two together
> and some of us that have been through the mud of Java and legacy
> integration can provide advice.
> 
> For instance, if you were going to front end RPG business logic with a
> Java web service and planned on using PCML or jt400's ServiceProgramCall
> object then we could tell you the limitations and things to watch out
> for (i.e. you can only have 7 parms in the parameter list when calling
> service programs from Java and the passback parm, if used, must be an
> integer).
> 
> A feature that V5R3 brings to the table is the ability for SQL stored
> procs to call RPG service program sub procedures.  So from your Java all
> you need to do is call like the following:
> 
>             DriverManager.registerDriver(new
> com.ibm.as400.access.AS400JDBCDriver());
>             connection =
> DriverManager.getConnection("jdbc:as400://99.99.99.99", "MYPROFILE",
> "MYPASSWORD");
>             CallableStatement cs1 =
>                 connection.prepareCall(
>                     "CALL PRODLIB.ACT_ADD(?,?,?,?,?,?,?,?,?,?,?)");
> 
>             cs1.registerOutParameter(1, java.sql.Types.CHAR);
>             cs1.registerOutParameter(2, java.sql.Types.DECIMAL);
>             cs1.setBigDecimal(3, new BigDecimal(acct.getDivision()));
>             cs1.setBigDecimal(4, new BigDecimal(acct.getSubDivision()));
>             cs1.setString(5, acct.getAddress(0).getName());
>             cs1.setString(6, acct.getAddress(0).getContact());
>             cs1.setString(7, acct.getAddress(0).getAddress1());
>             cs1.setString(8, acct.getAddress(0).getAddress2());
>             cs1.setString(9, acct.getAddress(0).getAddress3());
>             cs1.setString(10, acct.getAddress(0).getCity());
>             cs1.setString(11, acct.getAddress(0).getState());
> 
>             cs1.execute();
> 
>             String errDs = cs1.getString(1);
>             BigDecimal newAcctNum = cs1.getBigDecimal(2);
> 
> Here is the stored procedure:
> CREATE PROCEDURE PRODLIB.ACT_ADD
> (
>         OUT RTNMSG CHARACTER(143),
>         OUT ACTNUM DECIMAL(9, 0),
>         IN DIV DECIMAL(3, 0),
>         IN SUBDIV DECIMAL(3, 0),
>         IN NAM CHARACTER(35),
>         IN CNTNAM CHARACTER(35),
>         IN ADR1 CHARACTER(35),
>         IN ADR2 CHARACTER(35),
>         IN ADR3 CHARACTER(35),
>         IN CTY CHARACTER(30),
>         IN STT CHARACTER(2),
> )
> RESULT SETS 0
> LANGUAGE RPGLE
> SPECIFIC ACT_ADD
> NOT DETERMINISTIC
> NO SQL
> EXTERNAL NAME 'PRODLIB/ACTSV(ACT_ADD)'
> PARAMETER STYLE GENERAL
> 
> There are many more possibilities for Java to talk to RPG and vice
> versa. . .
> 
> Aaron Bartell
> 
> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx
> [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
> Sent: Tuesday, December 28, 2004 4:02 PM
> To: RPG programming on the AS400 / iSeries
> Subject: Java learning
> 
> I have started studying Java, and I am looking for recommendations as to
> reading material.  Specifically, I want to explore using Java with
> RPGIV.
> 
> Initially, I thought that it might be nice to deploy java applets in
> browsers as an inquiry/report delivery vehicle.  Once I started learning
> it, I can see many more uses also.  It is just hard to know where to
> start regarding using Java and RPGIV.
> 
> Suggestions?
> 
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